Ore-crushing machine.



PATENTED NOV. 7, 1905.

A A n fwav jzzvelzfol G. JOHNSTON.

ORE CRUSHING MACHINE.

Wfnmses UNITED. STATES PATENT OFFICE.

QRE-CRUSHING MACHINE.

Specification of Letters Patent.

Patented Nov. 7, 1905.

Application filed December 23, 1904- Serial No. 238,106.

To all whom it may concern:

Be it known that I, GEORGE JOHNSTON, a citizen of the United States ofAmerica, residing at San Francisco, county of San Fran.- cisco, andState of California, have invented certain new and useful Improvementsin Ore- Crushing Machines; and I hereby declare the following to be afull, clear, and exact description of the same, reference being had tothe accompanyingdrawings,forminga partof this specification,

This invention relates to roller crushingmachines for mineral ores ofthe-edge-running or Chilian type, and is an improvement on the inventionset forth in my copending application for Letters Patent, Serial No.209,584,

filed May 24:, 1904:, for an improvement in machines of a similar typefor crushing mineral ore.

My present improvement has for its object to drive such machines fromthe bottom instead of the top, retaining the functions and manner ofoperating set forth in theapplication for Letters Patent before referredto and as hereinafter fully explained.

The object of my present improvement is to adapt my improved rollercrushing-machines for usein large mills and in cases where a series ofsuch machines are operated from power applied below the floor orcrushing level, as illustrated by drawings herewith and forming a partof this specification.

Referring to the drawings, Figure I is a central vertical sectionthrough a roller crushing-machine of the gravity type constructedaccording to my invention. Fig. II is an enlarged cross-section on theline a a in Fig. I.

In machines of this type, commonly called edge-running or Chilian, aplurality of rollers are given a planetary motion about a fixed axis andat the same time rolling on a continuous bed or die-ring with a compoundpressing and twisting action.

In machines of this kind it has hitherto been customary to supply thebroken ore and water to the machine either on or outside of the die-ringand path of the crushing-rollers; so the material has been unequallytreated because of its falling inward after banking against the screensor walls without having passed through the crushing zone, thus fallingback irregularly against the centrifugal wash. To

avoid these objections, 1 construct these rollermills as shown in thedrawings, where 1 is the main frame, commonly called the pan,

and 2 supporting foundation-timbers as commonly arranged.

3 and 4 are two out of three crushing-rollers with which the machine isprovided.

5 is a central main shaft or spindle made hollow or tubular at the topand provided with a driving member 7, that communicates motion to arevoluble frame 8 by means of driving studs or pins 9, as shown in Fig.I.

The crushing-rollers are mounted on short shafts 10, that revolve inbearings in the frame 8, that gives a planetary motion about the axis ofthe machine and at the same time roll by traction on a die-ring 12 witha twisting or macerating motion that reduces the ore to a condition fineenough to be washed out through the screens 13.

Either integral with the main member or pan 1 or firmly bolted thereto Iprovide a strong down wardly-extending sleeve 14:, which forms asuflicient support for the central shaft 5 with bearings at 15 and 16, apacking-gland at 18 to exclude grit, protected by a removablehousing-plate 19 over the packing-gland, as shown in the drawings.

At 20 there is provided a shoulder to sustain weight of the shaft 5 andits connected parts, lubrication being provided through a pipe 29. inthe usual manner. On the bottom of the shaft 5 I show a drivinggear-wheel 23, engaged by a bevel-pinion 2st on a shaft but any othersuitable manner of driving can be adopted as the circumstances ofconstruction and connection may require.

The shaft 5 is made hollow at the top, as shown in the drawings, toprovide a central passage 26, through which ore and water descend from ahopper 28, pass out at the lateral passages 29 over the fixed conicalapron 6, and are spread around the inner side of the die-ring 12 bymeans of the curved vanes 31 and equally distributed around the machineinside the path of the rollers 3 4:, so that all the ore has to passbetween the crushing-surfaces before reaching the screens 13.

is a collecting-spout around the machine into which the screens 13discharge. and 32 the usual protectlng-curb fastened on top of the pan1.

Having thus explained the nature and objects of my invention, what Iclaim as new, and desire to secure by Letters Patent, is-

1. In a roller crushing-machine of the character described, a pan, adie-ring therein, a sleeve depending centrally from the bottom :co I

fixed-conical apron, means for rotating said shaft from the bottom, androtary crushingrollers, rolling on saiddie-ring and actuated by saidshaft, substantially as specified.

In testimony whereof I have signed my name to this specification in thepresence of two sub- -scribing Witnesses.

GEORGE JOHNSTON.

Witnesses ALFRED A; ENQUIST, ELMER WIoKEs.

